IMX7D GPIO00 watch dog function

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IMX7D GPIO00 watch dog function

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frankyhsu
Contributor III

Hi

We know that the GPIO00 has the WDG function.

1. Could we move that function to other GPIO? Because we want to have a GPIO default to pulled down.

2. Could GPIO00 be changed to default low when boot up?

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Yuri
NXP Employee
NXP Employee

Hello,

1.

  GPIO1_IO00 pin has (several) WDOG options. Generally customers can use other pins

for WDOG. Please use the i.MX Pins tool for selection.

Pins Tool for i.MX Application Processors|NXP 

2.

  After reset GPIO1_IO00 is configured as GPIO, 100K pull up

Such setting may be changed only by user's bootloader (U-boot).


Have a great day,
Yuri

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frankyhsu
Contributor III

Hi Yuri,

Thanks reply.

We use GPIO1_00 as the watch dog GPIO and we believe it is 100k pulled up when there is no code in serial download mode. We want this signal to keep low, so we add 10k to GND and the voltage will be 0.3V to stay low.

But we meet a terrible thing that when using MFG tool to upgrade the code, the GPIO will change it's status to strong pull-ed up even less than 5k pulled up after calculation in the upgrade process. How do we modify the setting in MFG tool to let the GPIO keep its own default setting? The abnormal behavior let our HW fail and reboot again and again unless we remove the GPIO connection.

Please help to clarify it, it is very critical.

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Yuri
NXP Employee
NXP Employee

Hello,

  GPIO1_00  is used as WDOG under NXP Linux BSP. The MFG tool uses 

special Linux implementation, based on the BSP.

Regards,

Yuri.

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